TCS Company Numerical Ability Sequence and Series

Two conjugative no are removed from the progression 1 2 3 ...n the arithmetic mean of the remaining no is 105/4 . the value of n is

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Ans:50; The best method to answer the question is options method. Sum of first n natural numbers = n(n+1)/2. Sum of the numbers after removing 2 consecutive numbers = 105/4 * (n-2). Now n(n+1)/2 - 105/4 * (n-2) should be sum of two consecutive numbers. 50 satisfies this condition.
9 years agoHelpfull: Yes(5) No(1)

please explain how it is 50??
9 years agoHelpfull: Yes(4) No(0)
Solution is 50.
9 years agoHelpfull: Yes(2) No(2)
Answer is 53
9 years agoHelpfull: Yes(0) No(0)
options are 50,81,60
9 years agoHelpfull: Yes(0) No(0)

TCS Other Question

Middle – earth is a fictional land inhabited by Hobbits, Elves, dwarves and men. The Hobbits and the
Elves are peaceful creatures who preferslow, silent lives and appreciate nature and art. The dwarves and the
men engage in physical games. The game is as follows . A tournol is one where out ofthe two teams that play a
match, the one that loses get eliminated. The matches are played in different rounds where in every round ,
half of the teams get eliminated from the tournament. If there are 8 rounds playedin a knock-out tournol how
many matches were played?
a) 257
b) 256
c) 72
d) 255 In the reading room of a library, there are23 reading spots.Each reading spot consists of a round table
with 9 chairs placed around it. There are some readers such that in each occupied reading spot there are
different numbers of readers. If in all there are 36 readers, how many reading spots do not have even a single
reader?
a) 8
b) None
c) 16
d) 15